Caliper



Palerme ree. 1e, ieee.

PAUL CHARLES LABASSE, OF NEVI ORLEANS, LOUISIANA.

CALIPER.

application filedieptemlzer 15, i923.

To all whom, t muy concern.'

Be it lrnownthat l, PAUL C. LirnAssn, a

citizen oit the United States, residing at New Orleans, in the parish of Orleans and of'Louisiana,y have invented neiv and useful improvements in Calipers, ot which the following is a specification.

This invention relates to a self-centering micrometer caliper, especially designed for obtaining diameters oit three winged valves or vother three winged or iluted objects, an object being to pr vide a three point gauge so as todetermine the diameter oi an openingrigor the acconnnodation of the object .Without the necessity et' feeling 'for a center and without calculations. i

Another object of the invention is to pro- V vide micrometer caliper for the above stated` and other purposes, b v means of which diameters may be readily and aecuratelgr obtained. A i il-.lith the above and other objects in view, the invention further includes the following novel features and details oit construetion, to be hereinafter more fully described1 illust 'ated inthe accompanying drawings and pointed out in the appended claims.

ln the drawings Figure l is an elevation illustrating the use orn the invention.

Figure 2 is a vertical the same.

Referring to the drawings in detail wherein like characters of reference denote corresponding parts, the reference character l `indicates an arm which includes a curved portion lau and en angular extremity lb whose included angle in the present case is sixty' degrees. Secured to the arm l is a barrel 2 whose bore is provided with u reduced threaded portion 3 for the reception or an exteriorljv' end interiorly threaded nut or sleeve Il. rEhe nut or sleeve et has threadedly engaged therewith a jam nut or loclr nut 5, the outer periphery ot which is tapered :t'or engagement with the walls of a similarly tapered portion 5a of the barrel bore. 4

Extending around and over the barrel 2 is a sleeve 6 Whose outer end is closed and has secured thereto the threaded portion V"l lor e spindle S. The threads 7 engage the threads upon the interior o sectional view of the Sleeve 0r Serial No. S629l.

nut l and are threaded 26% threads to the inch, for ai puriese to be later apparent. The outer end et the spindle 8 is provided with a threaded socket il so as to provide lor removable engagement with the threaded stud extending from the end olf a range pin lll. il number et diiierent range pins are emploved `for obtaining ditr'erent diameters. The pins are graded 0 to 1; l to 2; and 2 to 3 and are 'faced fiat at their ends ll to their proper lengths to come in Contact with standard diameters, such as l 2 and 3 dian'leters, when said diameters are engaging the opposite inner faces et the angle and when the sleeve (i is set at Zero.l iVhcn placed in position at die, the markings 12 on the die will register' when the faces between the spindle and pin are in proper Contact.

The inner end ot the sleeve G is beveled and is graduated as indicated at lf3, there being` twenty-live di\ sions around its eirpin and spin cunrterence. In addt'bn the barrel 2 is graduated as indicated et lil, the gradrur tions beingl 26% to the inch, or d() graduations to 11/2 inches extending along a line parallel witlrthe exis of the barrel.

Assuming that the ligure represented at fr in Figure l represents a three winged valve or other three winged or three i'luted object placed within the instrument and that its diameter is 2%. A range pin used 'for measuring diameters :from 2 to 2l" is secured to the end of the spindle and the ob- `ject is arranged so that the end l1 ot the range pin engages one wing, while the other two n'ings engage the opposite inner faces of n. (ill degree angle. The distance from the center il of the object to the apri; angle will. equal the diameter ol the objectl while the distance from the point` ll o'i the range pin te the uien l) et the :ingle if: equal to 1% times the diameter oi the el ject. Since the range piu. l() is made to receive the 2 standard diameter when the sleeve (i is sel. at Zero. it would only be neces sary to unseren' or move the sleeve outward tive turns to raise the spindle .18?5, (that being the pitch et the screw multiplied the number of turns of the sleeve) or .OSTX equals 13g of an inch, the amount the spindle should reise in order to bring the range pin the end et the spinin Contact with 21.21/8 circle, or 1/8 l1/2 equal fag. The thimble 6 Will then show a reading to the fifth line or l-oig as an ordinary micrometer' or a 21/8H diameter. The relation `between toe anglev and the screw is proportionate and readings to a. 10100 'part oran meh can easily loe obtained. llns caliper may he made to n'ieasure 3 diam vitallwvithin the seope ot the appended Claims.

Having;` Ydescribed the invention Whatis claimed is zl. A mierometer Caliper comprisinga harrel, an arm extending J'roin the barrel and terminating;I in an angular extremity with the apex of the angle in line With the axial Center of said barrel, a sleeve movable upon the barrel, there being' cooperating` graduations upon the sleeve and barrel, an adjusting nut threadedly engaging the bore of the barrel, a spindle secured to the sleeve and extending through and tlireadedly engaging the nut and a range pin detaehably secured to the spindle.

2. Ainierometer caliper comprising ak barrel provided with a bore having,`r a tapered portion, an arml extending from the barrel and terminating in an angular extremity With the apex of the angle in line with the axial Center of said barrel, a sleeve movable upon the barrel, there being cooperating gradua- .tions upon the sleeve and barrel, an adjusting nut tlireadedly engaging the bore of the barrel, a spindle secured to the sleeve and extending through and threadedly engaging the nut and a tapered jam nut threadedly engaging theadjueting nut and located Within a tapered portion of the here ot therbarrel and a range pin detaehably secured to the spindle.

3. A micrometer caliper comprising a barrel, an arm extendingfrom the barrel and terminating in an extremity raving an included angle of sixtydegrees, with the apex of the angle in line with the axial center of said barrel, a sleeve movable upon the barrel, there being coopera-ting graduations upon the sleeve and barrel, an adjusting nut tl'neadedly 'enga-ging the a spindle secured to the sleeve and extending' through and threadedly engaging the nut anda range pin carried by the spindle.

In testimony Whereofl affix my signature.

PAUL CHARLES LABASSE.

bore of the barrel, Y 

